Enter the length and width of the aperture and the thickness of the stencil into the calculator to determine the stencil area ratio.

## Stencil Area Ratio Formula

The following equation is used to calculate the Stencil Area Ratio.

SAR = [(L*W)/2*(L+W)*T]

- Where SAR is the stencil area ration
- L is the length of the aperture
- W is the width of the aperture
- T is the thickness of the stencil

## What is a Stencil Area Ratio?

Definition:

A stencil area ratio measures the area beneath the stencil aperture opening relative to the area of the inside aperture wall.

## How to Calculate Stencil Area Ratio?

Example Problem:

The following example outlines the steps and information needed to calculate Stencil Area Ratio.

First, determine the length of the aperture. In this example, the length is 5 inches.

Next, determine the width of the aperture. In this case, the width is 3 inches.

Next, determine the stencil thickness. This stencil has a thickness of 1 inch.

Finally, calculate stencil area ratio using the formula above:

SAR = [(L*W)/2*(L+W)*T]

SAR = [(5*3)/(2*(5+3)*1)]

SAR = .9375